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Posticobia ponderi Clark, 2009

Diagnostic features

Posticobia ponderi is generally smaller than the other two species of the genus; it only has 1–2 weakly developed pegs on the inner side of the operculum and the prostate gland is half in the pallial cavity. However, probably the most distinctive character is the total lack of a keel or shoulder on the body whorl of P. ponderi com­pared to the other species.

Classification

Posticobia ponderi Clark, 2009

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha 

Superfamily Truncatelloidea

Family Tateidae

Genus Posticobia Iredale, 1943

Original name: Posticobia ponderi Clark, 2009. Clark, S. A. (2009). The genus Posticobia (Mollusca:Caenogastropoda: Rissoidea: Hydrobiidae s.l.) from Australia and Norfolk Island. Malacologia 51: 319-341.

Type locality: Mulligan Springs, Lake Callabonna, 40.1kms east of the Wooltana-Moolawatanna road, South Australia.

Biology and ecology

Amongst small sedges in springs. Eggs similar to Posticobia brazieri.

Distribution

Known from a number of small springs that make up the Mulligan Springs complex on the western edge of Lake Callabonna. South Australia.

Further reading

Clark, S. A. (2009). The genus Posticobia (Mollusca: Caenogastropoda: Rissooidea: Hydrobiidae SL) from Australia and Norfolk Island. Malacologia 51: 319-341.